﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo02
{
     class S
    {
        public static int Mj(int a,int b)
        {
            return a * b;
        }
        public static double Mj(double c)
        {
            return c * c * 3.14;
        }
    }
}
